Cesium carbonate → 2-(4-{2-[2-(3,5-dimethoxyphenyl)ethyl]-5H-pyrrolo[2,3-b]pyrazin-6-yl}-1H-pyrazol-1-yl)ethanol

Temperature

60 °C

To a stirred solution of 2-[2-(3,5-dimethoxyphenyl)ethyl]-5-(phenylsulfonyl)-6-(1H-pyrazol-4-yl)-5H-pyrrolo[2,3-b]pyrazine (from Example 35, Step 1, 30.0 mg, 0.0613 mmol) in acetonitrile (1 mL), cesium carbonate (20.0 mg, 0.0613 mmol) and (2-bromoethoxy) (tert-butyl)dimethylsilane (13.1 μL, 0.0613 mmol) were added sequentially at ambient temperature. The reaction mixture was then warmed up to 60° C. After 2 hours, the reaction was quenched with water, and extracted with methylene chloride. The combined organic layers were dried over MgSO4, concentrated. The residue was dissolved in methylene chloride (1.0 m)/trifluoroacetic acid (1.0 mL) at ambient temperature. After 2 hours, the volatiles were removed under vacuum and the residues were dissolved in methanol (2.0 mL). Potassium carbonate (16.9 mg, 0.122 mmol) was added and the reaction mixture was warmed up to 60° C. After 1 hour, the crude mixture was purified on RP-HPLC (XBridge C18 column, eluting with a gradient of acetonitrile/water containing 0.05% TFA, at flow rate of 30 mL/min) to give the desired product (3.5 mg) as its TFA salt. LCMS calculated for C21H24N5O3 (M+H)+: m/z=394.2. Found: 394.2.

1. customthe reaction was quenched with water
2. extractionextracted with methylene chloride
3. dry with materialThe combined organic layers were dried over MgSO4
4. concentrationconcentrated
5. dissolutionThe residue was dissolved in methylene chloride (1.0 m)/trifluoroacetic acid (1.0 mL) at ambient temperature
6. waitAfter 2 hours
7. customthe volatiles were removed under vacuum
8. dissolutionthe residues were dissolved in methanol (2.0 mL)
9. temperaturethe reaction mixture was warmed up to 60° C
10. waitAfter 1 hour
11. customthe crude mixture was purified on RP-HPLC (XBridge C18 column
12. washeluting with a gradient of acetonitrile/water containing 0.05% TFA, at flow rate of 30 mL/min)

ORD record

ord-b00cad1138c64ada99502ed08e4bf668

Source dataset

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09388185B2